East Asia or Northeast Asia is the eastern subregion of Asia, which can be defined in either geographical or ethno-cultural terms. Geographically and geopolitically, the region constitutes of China, Hong Kong, Macao, Mongolia, North Korea, South Korea, Japan, and Taiwan. The East Asian states China, North Korea, South Korea, and Taiwan are all unrecognized by at least one other East Asian state. Hong Kong and Macau are officially highly autonomous but are under effective Chinese sovereignty. North Asia borders East Asia's north, Southeast Asia the south, South Asia the southwest, and Central Asia the west. To the east is the Pacific Ocean, and to the southeast is Micronesia (a Pacific Ocean island group, classified as part of Oceania).